Echinostomiasis adult worm

Adult of Echinostoma revolutum, stained with carmine. Structures illustrated in this figure include: oral sucker (OS), armed collar (CL), cirrus sac (CS), ventral sucker, or acetabulum (AC), uterus containing eggs (UT), ovary (OV), paired testes (TE), and vitelline glands (VT). This species has been recorded from humans in Taiwan.